TerraStab

Dikeprotection Yerseke NL

In the Netherlands, 26 percent of the country is below sea level and 29 percent is sensitive to river flooding. A multi-year flood protection program has been drawn up by the government. In this program, Terrastab applies the sustainability of soil stabilization to the reinforcement of dikes. The seawall at the Oosterschelde near Yerseke in The Netherlands should be reinforced with a construction on a stabilized foundation bed with a thickness of 40 cm. Between the stabilized base course and the construction is a water-permeable geotextile with a so-called “filter / street layer” of +/- 14cm. To this the setting stones are layed automatically.

Project dikeprotection through soil stabilisation. Read the jobreport.

Situation problem

Over almost the entire route length of the clay dike is in such a bad strength and stability that it should be replaced by a foundation material on which a special stone construction can be placed. In addition, the silty clay allows easy water to flow through allowing the stone construction may be endangered. With the traditional method, the silty clay layer had to be excavated and replaced by a layer of granulated blast furnace slag from 80 cm. The excavated clay must first be put in depot prior to further processing and deposition. This leads to extra time / removal and processing costs. Sales of the silty clay is an additional problem for the customer “Rijkswaterstaat” and due to the enormous volume of transport movement a lot of damage is to be expected in the immediate vicinity of the village and business park Yerseke.

Terrastab solution

The stabilization method had previously been used in a pilot project in 2010 in which the naturally occurring clay was stabilized with binders / excipients in such a way that the use of the stone construction was possible without reducing the sealing function of the dike. The stabilizing clay was treated in 2010 in a layer thickness of +/- 45 cm. The client is examined in conjunction with the administrator Rijkswaterstaat if the stabilization method could be optimized within the new dike improvement project . For this project in total between the 12,000 – 15.000 m3 needed to be excavated and disposed. Costs for transportation and disposal / storage of these silty clay would have become unacceptably high. In addition, this entire logistics operation would give an enormous burden for the local village and industrial area where a large part of the transport went through.

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